In order to investigate the capacity mechanism,failure mode and capacity elevated degree of stone-arch bridge,two groups of compressive specimens of stone masonry strengthened by injection high-performance cement composite concrete and one group of contrastive specimens were made for the axial compression test. The strengthening effects of the thickness of concrete on the strengthened stone masonry were analyzed. The experiment results showed that the cracking capacity of strengthened stone masonry can be greatly improved by 103.1%~119.8%,and the ultimate capacity can also be improved by 21.2%~36.4%.Strengthening stone-arch bridge with injection high-performance cement composite concrete is an effective method which can be employed to the strengthening engineering.
